Well its happening..
https://www.psxhax.com/threads/how-to-play-ps4-game-backups-on-retail-1-76-ofw-guide-by-burte.2805/
And via usb too..
https://www.psxhax.com/threads/kernel_hooks-elf-update-load-ps4-game-backups-homebrew-on-usb.2807/
Hopefully Homebrew will follow soon and then 4.50 plus..
It is nice to see things finally moving along, especially for those people lucky enough to have 1.76 systems
Fingers crossed those of us on 4.XX will see something for our machines soon